A variety of options have been proposed for placing vast satellites in space, typically at the L1 point1 between Earth and the Sun (Early, 1989). However, to compensate for the increase in GHGs, nearly 4,000 square miles (10,000 square kilometers) of reflective
1 "Lagrange Point 1" refers to a point roughly 1.5 million km above the surface of the Earth and between the Earth and the Sun. An object at the L1 point appears stationary from the perspective of Earth, as the net surface would need to be constructed and put into orbit each year—or approximately an additional 10 square miles per day each and every day—for as long as CO2 emissions continue increasing at rates comparable to today's (Govindasamy and Caldeira, 2000). Due to the magnitude of spaced-based deployment required for such an undertaking, and the enormous cost of putting objects into orbit, these options appear impractical for addressing threats posed by climate change this century.
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